“Guariti” (“recovered”) in the official data refers not only to those actually recovered (i.e. who tested negative twice), but to all those discharged from hospital. (high confidence | DPC, IP, IS24O, YT)

Are negative results included? Are pending results included?

In Italy “tamponi” should include those that are pending results. (high confidence | DPC, PM) Unfortunately this is not true for all regions:

In Valle d’Aosta “tamponi” are divided as follows

those analysed in-region exclude those that are pending results

those analysed out-of-region include those that are pending results. (high confidence | PM)

In Piemonte “tamponi” include those that are pending results. (high confidence | PM)

Documentation for Liguria is not available yet.

In Lombardia “tamponi” include those that are pending results. (high confidence | PM)

Documentation for Trentino-Alto Adige is not available yet.

In Veneto “tamponi” exclude those that are pending results. (high confidence | PM)

Documentation for Friuli-Venezia Giulia is not available yet.

In Emilia Romagna “tamponi” include those that are pending results. (high confidence | PM)

In Toscana “tamponi” include those that are pending results. (high confidence | PM)

In Umbria “tamponi” include those that are pending results. (high confidence | PM, UDPC)

In Marche “tamponi” exclude those that are pending results. (high confidence | PM)

Documentation for Lazio is not available yet.

Documentation for Abruzzo is not available yet.

Documentation for Molise is not available yet.

In Campania “tamponi” exclude those that are pending results. (high confidence | PM)

Documentation for Puglia is not available yet.

In Basilicata “tamponi” include those that are pending results. (high confidence | PM)

Documentation for Calabria is not available yet.

Documentation for Sicilia is not available yet.

In Sardegna “tamponi” exclude those that are pending results. (high confidence | PM)

Do the figures include all tests conducted in the country, or only some?

Figures reported by Italian authorities include all tests conducted in all working laboratories of the country. (medium-high confidence | MTP27-02, MTP09-03, MTP03-04)

Are all regions and laboratories within a country submitting data on the same basis?

The figures published at a given date attempt to include all tests conducted up to that date, but significant and variable delays are present: both from symptom onset to diagnosis (\(T_{s,d}\)) and from diagnosis to official notification (\(T_{d,n}\)). (medium-high confidence | ISS)

The median delay between the symptom onset and the date of diagnosis is

3 days for the period 20/02-29/02 (calculated on 1,609 cases);

5 days for the period 01/03-20/03 (37,060 cases);

7 days for the period 21/03-10/04 (27,637 cases);

6 days for the period 11/04-23/04 (6,299 cases). (high confidence | ISS)

What are the typical testing practices in the country?

Up to 20-03 we could identify 3 classes of testing practices described by the following pseudocode: consider two patients \(A\) and \(B\) living in the same house in the region \(R \in \{X, Y, Z\}\) such that